Method and Apparatus for Assessing Condition of Motor-Driven Mechanical System

a technology of motor-driven mechanical systems and condition assessment, which is applied in the direction of impedence measurement, structural/machine measurement, instruments, etc., can solve the problems of unreliable current as an indicator of fault condition, unreliable approach, and inability to accurately assess the condition of the motor-driven mechanical system
US20070282548A1Inactive Publication Date: 2007-12-06NANYANG TECH UNIV
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
NANYANG TECH UNIV
Publication Date
2007-12-06
Estimated Expiration
Not applicable · inactive patent

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Abstract

Conditions of a mechanical system driven (12) by a motor (14) can be assessed by monitoring an admittance or impedance at an input to the motor (14) over a period of time. The admittance or impedance may be determined by measuring the input voltage (22) and current (20). Variations in admittance or impedance are associated with known conditions including faults. An analyser (24) processes the admittance or impedance and provides a warning signal if a known fault condition is determined. The processing may be done using a neural processor.
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Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims priority from U.S. Provisional Application No. 60 / 551,336, entitled “APPARATUS FOR SENSOR-LESS MONITORING AND DIAGNOSIS”, and filed Mar. 10, 2004, the contents of which are hereby incorporated herein by reference.FIELD OF THE INVENTION

[0002] The present invention relates generally to motor-driven mechanical systems (MDMS), and more particularly to method and apparatus for assessing conditions of MDMS through motor input signals, including fault monitoring. BACKGROUND

[0003] It is desirable to detect fault conditions early in motor-driven mechanical systems (MDMS), for example, in order to correct the fault condition or to prevent damage to the system or the motor.

[0004] When the MDMS is driven by an electric motor, input signals to the motor have been used for monitoring and diagnosing mechanical problems associated with the driven machines as well as fault conditions in the motor. For example, the motor curren...

Claims

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